Abstract
Modularity technique is desirable in large permanent magnet synchronous machines (PMSMs) because it facilitates manufacture, assembly, and maintenance. Although the PMSMs with fractional-slot concentrated windings (FSCWs) allow their stators to be modularized, they usually suffer from high nonworking space harmonic content. The PMSMs with various reported two-slot pitch windings (TSPWs) show much lower nonworking space harmonic content, but they do not support stator modularity. This paper proposes a modular PMSM with a special dual three-phase (DTP) TSPW, which exhibits quite low nonworking space harmonic content. First, the topology of the proposed machine is described in detail. Then, the mechanism of reducing the nonworking space harmonic content of the machine is expounded through winding magnetomotive force (MMF) analysis. Finally, the electromagnetic characteristics of a specific proposed modular PMSM and a conventional modular PMSM with DTP-FSCW are compared by finite element method (FEM), in terms of electromotive force (EMF), armature reaction field, torque performance, efficiency and power factor. The FEM results demonstrate that the proposed machine can realize low space harmonic content while retaining stator modularity.
Highlights
Modularity is desirable in permanent magnet synchronous machines (PMSMs) because it is beneficial for easy manufacture, assembly, and maintenance [1,2,3]
The PMSMs with fractional-slot concentrated windings (FSCWs) allow their stators to be modularized and have many other advantages, such as high torque density, smooth output torque and fault tolerance [1,2,3,4,5,6], they are often plagued by high nonworking space harmonics produced by high subharmonic and slot-harmonic content of the winding magnetomotive forces (MMFs) of FSCWs [2,3,4,5,6]
This paper proposes a modular PMSM with low space harmonic content
Summary
Modularity is desirable in permanent magnet synchronous machines (PMSMs) because it is beneficial for easy manufacture, assembly, and maintenance [1,2,3]. In [30], another six-phase TSPW was proposed based on the stator shifting method, which was more effective in reducing nonworking space harmonic content than other three-phase TSPWs. Since the six-phase TSPW exhibits excellent performance in suppressing the nonworking space harmonic content, reference [31] gave a design procedure and some design criteria of this type of winding. All the above techniques with the employment of TSPWs can substantially reduce both subharmonics and slot-harmonics, they are characterized by continuously overlapped end windings, which disable stator modularity. To solve this dilemma, reference [35] proposed a novel dual three-phase (DTP) TSPW, which could lower the space harmonic content while keeping the advantage of stator modularity. The research indicates that the proposed machine substantially lowers the nonworking space harmonic content while retaining the modular stator
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